The best way to deal with mouthy teens in BGs is....

Sit the game out and watch.

Do just enough to avoid afk and make it clear you don't help immature teens and idiots.

This is especially effective in warsong when the teens start middle farming as it gets them especially irate.

It seems that they don't grasp the basic point that whilst they are free to play in a way that loses the game, others can't chose to not help them in doing so.

The crying is lovely to behold, I suggest people try it and see.